Why is it important that a plant's phloem extends into its leaves?
a. the phloem allows carbon dioxide to enter the leaf and oxygen to escape it during photosynthesis.
b. the phloem brings water and nutrients up from the roots so that photosynthesis can take place.
c. the phloem collects the sugars made during photosynthesis and carries them around the plant.
d. the phloem protects the leaf from sun damage and excess water loss on hot, sunny days.

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens